Eocene volcanic rocks (WAEOv;0)

State	Washington
Name	Eocene volcanic rocks
Geologic age	Eocene
Original map label	Ev
Comments	Luedke, 1998, indicates that some of this unit is basaltic; Tabor and others, 1993, reports that this unit is mostly andesite flows, tuff, porphyry and breccia with minor dacite, dacite breccia, and basalt, and minor volcaniclastic sandstone, conglomerate, and siltstone; Smith, 1993, reports that this unit is all Eocene andesite. Dragovich and others, 2002, reports that this unit is mostly andesite but includes basalt and dacite flow, breccia, and tuff with interbedded sandstone, conglomerate, and argillite.
Primary rock type	andesite
Secondary rock type	basalt
Other rock types	dacite; sandstone; conglomerate; siltstone; argillite
Lithologic constituents	Major Igneous > Volcanic > Mafic-volcanic > Andesite (Flow) Minor Igneous > Volcanic > Felsic-volcanic > Dacite (Flow) Igneous > Volcanic > Mafic-volcanic > Andesite (Pyroclastic, tuff) Igneous > Volcanic > Mafic-volcanic > Andesite (Volcaniclastic, volcanic breccia) Incidental Sedimentary > Clastic > Siltstone (Bed) Sedimentary > Clastic > Sandstone (Bed)Feldspathic to volcaniclastic to tuffaceous. Sedimentary > Clastic > Conglomerate (Bed) Igneous > Volcanic > Mafic-volcanic > Basalt (Flow)Possibly breccia and tuff as well. Possibly minor in rank. Igneous > Volcanic > Felsic-volcanic > Dacite (Volcaniclastic, volcanic breccia)Possibly minor in rank. Metamorphic > Argillite
Map references	Huntting, M. T., Bennett, W. A. G., Livingston, V. E. Jr., Moen, W. S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000.
Unit references	Huntting, M. T., Bennett, W. A. G., Livingston, V. E. Jr., Moen, W. S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000. Luedke, Robert G., 1998, Maps showing distribution, composition, and age of Early and Middle Cenozoic volcanic centers in Oregon and Washington: U.S. Geological Survey Miscellaneous Investigations Series Map I-2291-D, scale 1:1,000,000. [http://pubs.er.usgs.gov/publication/i2291D] Tabor, R. W., Frizzell, V. A., Jr., Booth, D. B., Waitt, R. B., Whetten, J. T., Zartman, R. E., 1993, Geologic Map of the Skykomish River 30- by 60-Minute Quadrangle, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1963, scale 1:100,000. [http://pubs.er.usgs.gov/publication/i1963] Smith, J. G., 1993, Geologic Map of Upper Eocene to Holocene Volcanic and Related Rocks in the Cascade Range, Washington; U. S. Geological Survey Miscellaneous Investigations Series Map I-2005, scale 1:500,000. [http://pubs.er.usgs.gov/publication/i2005] Dragovich, J. D., Logan, R. L., Schasse, H. W., Walsh, T. J., Lingley, W. S., Jr., Norman, D. K., Gerstel, W. J., Lapen, T. J., Schuster, J. E., Meyers, K. D., 2002, Geologic Map of Washington-Northwest Quadrant: Washington Division of Geology and Earth Resources Geologic Map GM-50, scale 1:250,000.
Geographic coverage	King - Lewis - Snohomish